Worst mass shootings in U.S. history

mySA.com

Associated Press

12of16

12. July 20, 2012, Aurora, Colo.

Twelve people were killed when a gunman entered a movie theater, released a gas canister, then opened fire during opening night of the Batman movie “The Dark Knight Rises.” James Holmes, a 24-year-old former graduate student at the University of Colorado, has been charged in the deaths.

Twelve people were killed when a gunman entered a movie theater, released a gas canister, then opened fire during opening night of the Batman movie “The Dark Knight Rises.” James Holmes, a 24-year-old former graduate student at the University of Colorado, has been charged in the deaths.